Estudo do metabolismo de rotina e excreção de amônia do antípoda antártico Waldeclàa obesa em duas temperaturas distintas

Gomes, Vicente; Phan, Van Ngan; Passos, Maria José de Arruda Campos Rocha

doi:10.1590/s0373-55241995000200005

Cited by 6 publications

(5 citation statements)

References 22 publications

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“…Low metabolic levels in Antarctic invertebrates were also observed by other authors (Clarke 1991;Chapele and Peck 1995;Gomes et al 1995).…”

Section: Discussionsupporting

confidence: 80%

“…The present results indicate that the excretion of S. neumayeri is about 3 times larger than that of L. variegatus. Ammonia excretion rates are much more variable, once it is a very complex process which is exposed to the influence of variables of difficult control, such as the nutritional state or the kind of substratum that has been used for the oxidative processes (Echevarría et al 1993;Gomes et al 1995). Nevertheless, the O:N ratio can be used to estimate the substratum that is being used to supply energy demands (Maysaud and Conover 1988).…”

Section: Discussionmentioning

confidence: 99%

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Energetic metabolic differences between tropical (Lytechinus variegatus) and polar (Sterechinus neumayeri) echinoderms

BORGES,

SILVA,

ROCHA

et al. 2012

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The objective of the present study is to evaluate and compare the oxygen consumption of individuals of two species of sea urchins, one tropical (Lytechinus variegatus) and the other polar (Sterechinus neumayeri). Measurements were held in respirometric sealed chambers. It was observed that individuals of L. variegatus, in spite of being larger and heavier, have higher oxygen consumption rates (per unit of body weight) than S. neumayeri. This is probably an adaptation to polar conditions as a result of a long evolutional history of polar invertebrates in an environment with low temperatures and high seasonality of food production. The O:N ratio of S. neumayeri was the same as that of L. variegatus, which indicates that both species were using a similar substratum for metabolic demands.

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“…Low metabolic levels in Antarctic invertebrates were also observed by other authors (Clarke 1991;Chapele and Peck 1995;Gomes et al 1995).…”

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Energetic metabolic differences between tropical (Lytechinus variegatus) and polar (Sterechinus neumayeri) echinoderms

BORGES,

SILVA,

ROCHA

et al. 2012

PAB

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“…Antarctic ectotherms have developed complex mechanisms to adjust physiological processes to stable water temperatures and salinity, mainly with a view to energy saving ROGERS et al, 2007), in spite of considerable interespecific differences between them (CHAPELLE; PECK, 1995;GOMES et al, 1995). Our data seem to fit these environmental aspects of stability.…”

Section: Discussionmentioning

confidence: 49%

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

et al. 2013

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A B S T R A C TChanges in environmental factors may deeply affect the energy budget of Antarctic organisms as many of them are stenothermal and/or stenohaline ectotherms. In this context, the aim of this study is to contribute to knowledge on variations in the energy demand of the Antarctic amphipod, Gondogeneia antarctica as a function of temperature and salinity. Experiments were held at the Brazilian Antarctic Station "Comandante Ferraz", under controlled conditions. Animals collected at Admiralty Bay were acclimated to temperatures of 0°C; 2.5°C and 5°C and to salinities of 35, 30 and 25. Thirty measurements were made for each of the nine combinations of the three temperatures and three salinities, totalling 270 measurements. Metabolic rates were assessed by oxygen consumption and total nitrogenous ammonia excretion, in sealed respirometers. When acclimated to salinities 30 or 35, metabolic rates at 0°C and 2.5°C were very similar indicating a possible mechanism of metabolic compensation for temperature. At 5.0°C, however, metabolic rates were always higher. Lower salinities enhanced the effects of temperature on metabolism and ammonia excretion rates. The physiological adaptations of individuals of G. antarctica suggest adaptive mechanisms for energy saving, adjusted to an environment with stable conditions of temperature and salinity. Little is known about the joint effects of salinity and temperature and this study is an important contribution to the understanding of the mechanism of polar organisms in their adaptation to both factors. R E S U M OAlterações ambientais podem modificar a alocação de energia dos organismos, principalmente dos ectotermos estenotérmicos e/ou estenohalinos. Nesse contexto, este trabalho contribui com o conhecimento da demanda de energia do anfípode antártico Gondogeneia antarctica em função da temperatura e da salinidade. Experimentos foram realizados na Estação Antártica Brasileira "Comandante Ferraz", em condições laboratoriais controladas. Animais coletados na Baía do Almirantado foram aclimatados a temperaturas de 0°C; 2.5°C e 5°C e salinidades de 35, 30 and 25. Foram realizadas trinta medições para cada uma das nove combinações das três temperaturas com as três salinidades, totalizando 270 medições. As taxas metabólicas foram estimadas por meio do consumo de oxigênio e excreção de amônia, em câmaras respirométricas seladas. Quando aclimatados a salinidades 30 ou 35, as taxas metabólicas a 0°C e 2.5°C foram semelhantes indicando possível mecanismo de compensação térmica, nessa faixa de variação dos fatores. A 5.0°C, no entanto, as taxas metabólicas foram sempre mais elevadas. Baixas salinidades potencializaram os efeitos da temperatura no consumo de oxigênio e na excreção de produtos nitrogenados. Os resultados estão relacionados a mecanismos adaptativos para economia de energia em indivíduos G. antarctica, ajustados a um ambiente que tem condições estáveis de temperatura e de salinidade. Pouco se sabe sobre os efeitos conjugados da salinidade e temperatura nos organismos e...

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“…Nevertheless, the highly stable temperature conditions of Antarctic waters and habitat similarities directed their metabolic adaptations to the same range of resistance. The metabolic rates of B. gigantea and G. antarctica (GOMES et al, 2013), both of which live in well illuminated shallow waters, are relatively higher than the same rates for other amphipods such as Waldeckia obesa, a scavenger of dark, deep waters (CHAPELLE; PECK, 1995;GOMES et al, 1995). At salinity 35 and 0°C, correcting for the effects of body mass using the method described by STEFFENSEN et al (1994), the mean oxygen consumption rate of B. gigantea was 56 µlO 2 /g/h, whereas the mean oxygen consumption rate of G. antarctica is 65 µlO 2 /g/h and that of W. obesa is only 16 µlO 2 /g/h.…”

Section: Discussionmentioning

confidence: 97%

OXYGEN CONSUMPTION AND AMMONIA EXCRETION OF THE ANTARCTIC AMPHIPOD Bovallia gigantea PFEFFER, 1888, AT DIFFERENT TEMPERATURES AND SALINITIES

et al. 2014

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A B S T R A C TThe energy budget of Antarctic stenothermic and/or stenohaline ectotherms is modulated by variations of temperature and salinity. The joint effects of these latter on polar organisms have been but little studied. Data on this subject are of great importance for an understanding of the energy demand of Antarctic animals such as amphipods, especially when considering their ecological importance and the possible impacts of global changes. Experiments were carried out at the Brazilian Antarctic Station "Comandante Ferraz" under controlled conditions. Specimens of Bovallia gigantea were collected in Admiralty Bay and acclimated to temperatures of 0°C; 2.5°C and 5°C and to salinities of 35, 30 and 25. Thirty measurements were taken for each of the nine possible combinations of the three temperatures and the three salinities. Metabolic rates were assessed based on oxygen consumption and total ammonia nitrogenous excretion in sealed respirometers. At 0°C and 2.5°C, the metabolic rates of the animals that were acclimated to salinities of 30 or 35 were similar, indicating a possible mechanism of metabolic independence of temperature. However, the metabolic rates were always higher at 5.0°C. The effects of temperature on oxygen consumption and on ammonia excretion rates were intensified by lower salinities. Individuals of B gigantea have a temperature-independent metabolic rate within a narrow temperature window that can be modified in accordance with salinity. R E S U M OO orçamento energético de animais ectotérmicos antárticos estenotérmicos e/ou estenohalinos é fortemente modulado pelas variações da temperatura e da salinidade. O efeito conjunto desses fatores em animais polares é pouco estudado. Dados sobre esse assunto são necessários para avaliar a demanda energética de organismos antárticos, como os anfípodes, principalmente devido a sua importância ecológica e aos possíveis impactos ocasionados por mudanças globais. Os experimentos foram realizados na Estação Antártica Brasileira "Comandante Ferraz", em condições controladas. Indivíduos de Bovallia gigantea coletados na Baía do Almirantado foram aclimatados às temperaturas de 0°C, 2,5°C e 5°C e às salinidades de 35, 30 e 25. Foram realizadas 30 medições para cada uma das nove combinações possíveis entre os fatores. Foram mensurados o consumo de oxigênio e a excreção de produtos nitrogenados, em câmaras respirométricas seladas. A 0°C e 2,5°C, as taxas metabólicas de indivíduos aclimatados às salinidades 30 ou 35 foram muito semelhantes, indicando um possível mecanismo de independência metabólica à temperatura. A 5,0°C, as taxas metabólicas foram sempre mais elevadas. Os efeitos da temperatura sobre as taxas de consumo de oxigênio e de excreção de produtos nitrogenados foram intensificados pela diminuição da salinidade. Indivíduos de B. gigantea apresentam independência térmica das taxas metabólicas em uma pequena janela de variação, que pode ainda ser modificada pela salinidade.

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Estudo do metabolismo de rotina e excreção de amônia do antípoda antártico Waldeclàa obesa em duas temperaturas distintas

Cited by 6 publications

References 22 publications

Energetic metabolic differences between tropical (Lytechinus variegatus) and polar (Sterechinus neumayeri) echinoderms

Energetic metabolic differences between tropical (Lytechinus variegatus) and polar (Sterechinus neumayeri) echinoderms

Metabolic rates of the antarctic amphipod Gondogeneia antarctica at different temperatures and salinities

OXYGEN CONSUMPTION AND AMMONIA EXCRETION OF THE ANTARCTIC AMPHIPOD Bovallia gigantea PFEFFER, 1888, AT DIFFERENT TEMPERATURES AND SALINITIES

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